* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.container {
    width: 100%;
    height: 100vh;
    background: linear-gradient(135deg, #153677, #4e085f);
    padding: 10px;
}

.todo-app {
    width: 100%;
    max-width: 540px;
    background: #fff;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    border-radius: 10px;
}

.todo-app h2 {
    color: #002765;
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.todo-app h2 img {
    width: 30px;
    margin-left: 10px;
}

.row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #edeef0;
    border-radius: 30px;
    padding-left: 20px;
    margin-bottom: 25px;
}

input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
    font-weight: 14px;
}

button {
    border: none;
    outline: none;
    padding: 16px 50px;
    background: #ff5945;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    border-radius: 40px;
}

ul li {
    list-style: none;
    font-size: 17px;
    padding: 12px 8px 12px 50px;
    user-select: none;
    cursor: pointer;
    position: relative;
}

ul li::before {
    content: '';
    position: absolute;
    height: 28px;
    width: 28px;
    border-radius: 50%;
    background-image: url(https://i.pinimg.com/originals/c1/28/2d/c1282df2d016d473a4fe0a9337965b11.png);
    background-size: cover;
    background-position: center;
    top: 12px;
    left: 8px;
}

ul li.checked {
    color: #555;
    text-decoration: line-through;
}

ul li.checked::before {
    background-image: url(https://images.vexels.com/media/users/3/157931/isolated/preview/604a0cadf94914c7ee6c6e552e9b4487-curved-check-mark-circle-icon.png);
}

ul li span {
    position: absolute;
    right: 0;
    top: 5px;
    width: 40px;
    height: 40px;
    font-size: 22px;
    color: #555;
    line-height: 40px;
    text-align: center;
    border-radius: 50%;
}

ul li span:hover {
    background: #edeef0;
}

@media only screen and (max-width: 600px) {

    .container {
        width: 100%;
        background: linear-gradient(135deg, #153677, #4e085f);
        padding: 10px;
    }

    .todo-app {
        width: 300px;
        position: relative;
        left: -7vh;
        margin: 100px auto 20px;
        padding: 40px 30px 70px;
        border-radius: 10px;
        
    }
    .row {
        padding-left: 20px;
        margin-bottom: 20px;
    }
    input {
       width: 200px;
height: 20px;
    }
    button {
    }
}